Abstract
Glass-like carbon material has properties suitable for precision parts and indentation tests on samples of the material with a square-based diamond pyramid indenter have been conducted to provide deformation and fracture characteristics. This material was found to be highly elastic-brittle, showing largely elastic deformation at loads lower than 0.1 N. The ratio of plastic-to-elastic deformation is 1-2%, much smaller than in glasses. Cracks were formed at loads of more than 2 N with patterns square and parallel to the edges of the indenter contact area but median and radial cracks (normal crack patterns in brittle materials) were not observed. Using Puttick's equation, the scale of brittle-ductile transition is estimated as tens of nanometres. Sliding indenter tests give lower crack initiation loads than those obtained from the indentation tests.
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